There is a 5v coming from usb, that can be measured on the usb connector itself (search "usb pinout"). And there is a 5v made by the regulator on board, meaning the board should have 5v also when the usb is not connected. Measure them separately perhaps that helps pointing out an issue.
Either way i think the 4.68v look suspicious. The 5v regulators have some error margin, but in few % range, perhaps it could be 4.92v ok like that, but as low as 4.68v that it should not be that much of a difference. Maybe you have a short somewhere, or maybe the regulator is defective. You could try measure the resistance (offline) between the 5v line and gnd of the board see if that is unusual.
Either way i think the 4.68v look suspicious. The 5v regulators have some error margin, but in few % range, perhaps it could be 4.92v ok like that, but as low as 4.68v that it should not be that much of a difference. Maybe you have a short somewhere, or maybe the regulator is defective. You could try measure the resistance (offline) between the 5v line and gnd of the board see if that is unusual.
